JPH042525Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a sheet document holding device for holding down a sheet document wrapped around a rotating drum.

<Prior art> Conventionally, in copying machines and facsimile machines, an inserted sheet original is automatically wrapped around a rotating drum for exposure, rotated, and when the exposure is completed, the sheet original is ejected from the drum circumference. A device equipped with an automatic paper feed/discharge device has been proposed. In a conventional apparatus of this type, two presser rollers are disposed on the circumferential surface of the drum with the exposure area sandwiched therebetween in order to prevent the sheet document from lifting up.

However, although this method can prevent the beginning and middle parts of the sheet document from lifting up, it has the disadvantage that the moment the trailing edge comes off the presser roller, the trailing edge of the sheet lifts off the drum surface, making accurate reading impossible.

Therefore, in order to eliminate such drawbacks, the applicant filed Japanese Patent Application No. 59-185123 entitled "Automatic Sheet Winding Device".
Accordingly, a sheet document holding device having a structure as shown in FIG. A sheet original holding device has been proposed which can be placed against the exposed portion of the peripheral surface of the drum by fixing one or both ends thereof via a spring 15.

According to this sheet original holding device, the sheet original can be held down in the exposure section, so
It is possible to prevent the sheet document from rising at the exposed portion, and therefore it is possible to accurately read the document to the end.

However, in this sheet document holding device, pin 13
If the diameter of the wire is small or its coefficient of friction is large, the tension of the wire 14 will not be transmitted well to the pin 13, and a constant tension will not be obtained over the entire area of the wire. Therefore, if an excessive force is applied to the wire 14, it cannot be completely absorbed by the spring 15 provided at one or both ends of the wire 14, resulting in a problem that the wire may break.

<Purpose> The present invention was made in view of the above problems, and its purpose is to provide a highly reliable sheet original holding device that can prevent wire breakage with an extremely simple structure.

<Example> The present invention will be explained in detail below based on the figures.

FIG. 1 is a schematic diagram of an automatic sheet document feeder/discharge device employing a sheet document holding device according to the present invention.

In the figure, 1 is a rotating drum, 2 is a claw provided on the circumferential surface of the drum, and a sheet original 3 whose leading end is held by the claw 2 is rotated by the drum as it rotates in the direction of the arrow in the figure. It is designed to be wrapped around the circumference.

Reference numeral 4 denotes an exposure lamp, and the sheet original in the exposure area 5 is exposed by this exposure lamp, and the light reflected from the original surface (shade information) is guided to a photoreceptor (not shown) via a mirror 6. It's getting old.

Reference numeral 7 denotes a sheet document holding device according to the present invention, and this device is constructed as shown in FIG. That is, a plurality of through holes 8 are provided at appropriate intervals around a rectangular frame body, and a coil spring 9 is attached to each through hole 8, respectively.
Further, as shown in the figure, tungsten wires 10 with a wire diameter of 0.1 mm, for example, are sequentially hooked onto the coil spring 9 and stretched in a wavy manner.
It is fixed to the frame with.

According to the above configuration, since each top of the wire 10 is supported by the coil spring 9,
Even if an excessive force is applied to a portion of the wire 10, the force can be absorbed very smoothly by the appropriate extension of each coil spring 9.

Although the coil spring 9 is used in the embodiment, the same effect can be obtained by using an elastic pin instead.

<Effects> As explained in detail above, the sheet original holding device of the present invention has a wire-shaped object stretched across the frame in a wavy manner via an elastic member, so wire breakage can be prevented with an extremely simple structure. Therefore, it is possible to provide a highly reliable sheet document holding device.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an automatic sheet document feeder/discharge device employing the device of the present invention, FIG. 2 is a detailed view of the device of the present invention, and FIG. 3 is a diagram showing a conventional example. 1 is a rotating drum, 2 is a claw, 3 is a document, 4 is an exposure lamp, 7 is a sheet document holding device, 8 is a through hole, 9
is a coil spring, 10 is a wire, and 11 is a screw.

Claims (1)

[Scope of utility model registration request] In a sheet original holding device on the peripheral surface of a rotating drum in which a single linear object is stretched in a wavy manner within a frame, each top of the linear object formed in a wavy manner is held by an elastic member. A sheet original holding device, characterized in that the sheet original holding device is attached to the frame body.